Sorry I can't be of help on the earlier years. I used this as a guide for 79-80 trucks:
The Definitive 79-80 Desmog Guide - https://forum.ih8mud.com/threads/the-definitive-79-80-desmog-guide.812197/
This thread may have some pics that are helpful
My Desmog Keeping HAC Lots of Pics -...
I think you answered your own question.The only people who seem to keep the emissions are those living in a smog state(mainly CA owners) and the nut and bolt concours restoration folks.
No harm in removing properly, cleans the engine bay up alot.Definetly save the parts as you mention.
There is...
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